Any reason to keep 3.1.2

I have a 16G 3G running 3.1.2 that never got updated to 3.1.3. The baseband is still at 4.26.08. I plan on selling this phone eventually to upgade to an phone 4 but for the time being wouldn't mind updating to ios4 and jailbreaking. Is there any reason I should stay at 3.1.2? I posted my phone on craigslist and it seems people prefer 3.1.2 and 4.26.08 (i presume because it will be easier to jb). Thoughts?

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